(4steps total) PrintForm Definitions union Sections StandardLIB Doc
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At: outr wf 1
1. A : Type
2. B : Type
3. x : A+B
4. isl(x)
  outr(x)  B
By: (Analyze 3) THEN (Reduce -1)

Generated subgoals:

1 3. x1 : A
4. False
  outr(inl(x1))  B
Trivial
2 3. y : B
4. True
  outr(inr(y))  B
1 step

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assertunioninlinruniversemember
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(4steps total) PrintForm Definitions union Sections StandardLIB Doc